期刊
PHYSICAL REVIEW LETTERS
卷 98, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.98.135502
关键词
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资金
- NERC [NE/C515698/1] Funding Source: UKRI
- Natural Environment Research Council [NE/C515698/1] Funding Source: researchfish
We study the response of a radiation-amorphized material to high pressure. We have used zircon ZrSiO4 amorphized by natural radiation over geologic times, and have measured its volume under high pressure, using the precise strain-gauge technique. On pressure increase, we observe apparent softening of the material, starting from 4 GPa. Using molecular dynamics simulation, we associate this softening with the amorphous-amorphous transformation accompanied by the increase of local coordination numbers. We observe permanent densification of the quenched sample and a nontrivial pressure window at high temperature. These features point to a new class of amorphous materials that show a response to pressure which is distinctly different from that of crystals.
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